Feedback Mechanism Flashcards
refers to physiological
processes by which organism
maintain constant and balanced
physical and chemical factors in their
internal environment.
Homeostasis
refers to the
environment surrounding cells, that
is, the tissue fluid that envelops each
cell.
Internal Environment
occurs when a
change in a factor causes the value
of that factor to rise or fall even further. It is usually harmful but in
certain circumstances, it becomes
useful
Positive Feedback
regulatory system in which any change in the
value of a physical or chemical factor will trigger a correction mechanism to reduce that value and vice versa
Negative Feedback
detects any change in physical or chemical factors of the internal environment
receptors
temperature, blood pressure, and osmotic pressure are examples of _____________
physical factors
pH value, sugar concentration, and tissue fluids are examples of _____________
chemical factors
the parts of homeostatic control
receptors
a control center
a mechanism
effectors
it defines changes
control center
executes corrective actions
effectors
organs that regulates blood glucose level
pancreas and liver
_______ is carried from the intestine to the liver through hepatic portal vein.
Simple sugar (glucose)
In the liver, the simple sugar may be:
-converted to CO2 and water through cell respiration
-converted into glycogen for storage
-converted into fat to be stored as adipose tissue
-released into the blood stream
True or False
The liver can detect changes in blood glucose level.
False, it is detected by pancreas.
Pancreas functions as an endocrine gland to secrete the hormones _____ and _______.
insulin, glucagon
Insulin and Glucagon are secreted by the islets of ___________ that comprise two types of cells.
Langerhans
secrete the hormone glucagon
alpha cells
secrete the hormone insulin
beta cells
When is the hormone insulin secreted into the blood to be taken to the liver?
when the blood sugar rises
When the blood sugar level drops, what hormone is secreted into the blood and transported to the liver?
glucagon
the constant body temperature for birds
40-43°C
The regulation of blood glucose is an example of a ___________ mechanism.
negative feedback
two ways in which homeostatic imbalance can cause disease or malfunction in cells
deficiency
toxicity
animals that obtain heat from within the body through physiological metabolite processes
endothermic animals
